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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c350f8b3301838ce5b322459afb895b3674a68b8e71be10bd0fad261771fd42' 
  AND token = 'a6wKTzjil7J4m5+RuMFNSqaH5stuh6l1kErBI52VICc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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