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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabd55e531cd6d42ad9d59165b69ca666a5bc9edcb6fac633cb77d36a5915b00' 
  AND token = '3ttPAHU4Dmm+GSRXSrTWW6P5gf9pfARvyL6qcpFRWKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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