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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf38dcc803732d0220ec5d2b931ac4df13e4aaebe6423c24a87ee0bf3fbd6764' 
  AND token = 'J9gD4ewnuvGP56ES5GSQbI5Sp+Go640dBwGf9U0hdhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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