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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dde464662b4664a3ab96797b728c2e9827b5211e2573b99145a2ec332124dc' 
  AND token = 'cW6vG6gXEgteoct00kev2RurxCjvnwKFfMlZ5y8ul6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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