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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d4f4e090bc46a9ddff4030ec487635d7bd06927f946a08bd2f9c75fc498d4d' 
  AND token = 'MF+B3RFU6YLKjQMLQuOqlyzPx2yp1VhsWdWT5h77FIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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