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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f48c165f68382984ebbead138b83f52a91b0b9bfd5797aa894e6a6cd4f0e0c' 
  AND token = 'azKJ8H+KpCUBFFQW4pYJsm88c0Qcpsk/JTaOdD3j5N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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