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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7533049796935564b3c68182275547682df9dee213257a3bdb247ae9ee6bf083' 
  AND token = '3v9QlEeWJekcbEParXwCCe0oqLf+2cml6nv4EOF0Rns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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