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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3711447930e054f8991c715812423248939319e05004febee300cac2602599f' 
  AND token = 'RM7jMqvmfo8asT6H0VMDSobQLsjtXur/T2brzwszx6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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