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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9810b0ac4483e5ef4687b5ca18cf025e1e81462672ac3cfcca1f085aefebbce8' 
  AND token = '1QH8LahQnhVUdnAkaT4qoBwny3SgKH04gaE0qXtww1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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