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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9be53c5da7b616c1e1c815863765c561914549bac54d18ba98c7ca53e6b053' 
  AND token = 'qqZj6JlFf4kPDql3hw4xnOYTq8r9XDf4keb02Z1vdOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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