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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb6b5a5a3997f5dcba2e9a94e3d9a1969755952303bdd85a463e645b5903d59' 
  AND token = 'dGkLXiB+py7eJDgMTWZcauy7jYehmLiIr15W9/t/hL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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