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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76b009acc5f56e71a1c6313e684df458d465142ae2b43567a26d32fe0a23037' 
  AND token = '7wgwuLlkrJWWIZVSVhIFUzNMU48ODB6SLZWWl0lo86Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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