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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d9d0ab15ff4e7006a30a74a27341971930187d57228ef6ad8ed53701cc6233' 
  AND token = 'b36lV7n9LbnJ1sKBFdnPBjP+YWpHCrf+1khWxSMha3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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