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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201e66076d9174853e5348ad9c7a3080c989514e24f9d5b1523cfbed79318c4c' 
  AND token = 'Y/D5wx0nrC7Sb7dXblD5H9ThoQbPl32Kyyzsoo27MZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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