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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ac078363a67594f0d734df9f4d2675563df0e3533c9cac46b974b96b744b61' 
  AND token = 'Be41IfDyS7Ef1jLSim/r49C/aEc3onmc0s4iS3y7Rlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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