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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15cad8abce9925fc9c60e8ec638704f2f0558dc08c3c9a1c224cfbd1c8f79bf' 
  AND token = 'Xxct3OSX1VQkZ/88m27u48QjADM+XiwL7jeLaAWjMv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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