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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edddcbc66fb17b30814967956b87a7d9dfaf6a9a65edc8f08eb7b608d6c21bf0' 
  AND token = 'SDjsvNfPh7PQiLI5m6jpzkBE3v3NHU1a/0QP408KpyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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