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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af345765c6d8a70189b01c46a74e8cb1a3b81122e94c9159296055befb48d0d' 
  AND token = 'fUlFxo6NB4X9CT1HLxgl69jXUrpFYlfyOpImralKK5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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