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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b030d533ae76f450cdff38145f9410245d810df8ce819d14a38d9fceda1d6a21' 
  AND token = 'BpmjIDoXBOaJlAQTFwKPs88iN4pp9+P9a25gdnK/bbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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