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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17add10eeca26ae5507b76f7a2680bfae60bd2fccbe55fe7cb8f9ec2da06c7cd' 
  AND token = 'JPIMiZdNSB3jWFpFqne23CSkI28sVdKwNQMb8Og3zHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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