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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc51f0efaca729d5a356e95a978e5a9846d58e6f50f91a24e4948b45b00c0ab' 
  AND token = 'jQbDE7fA8C955rNkIvjcN3FXuusn1TMJWuOueiHAwe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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