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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c826dfae9c5591fb6278e87306ff9c780722c32f7be436e472b6d1e62c990888' 
  AND token = 'UZryB7NI1lRVUBcQl5f8WFD/qYFInoxj8aokR6InLXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}