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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabdb20bbf329e5a5880acc564466b15b051e2e4dfe4e494096fabfeb2df991a' 
  AND token = 'xls10CBZ8f/k7iVgbxw0Qzo4HBUTyAgp679fF1LZQdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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