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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41a5d56fe06d97dcc7846a4e3be26ecf675bd599c816d2b915f0b9db3c974e6' 
  AND token = 'O0Yh6QsuMN2zfR9A4SAIkMd8qx3PGN3ro2TRNvBht+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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