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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487cc01946d1abff63a3b2ee99a9b710b3e41cd26d43a76246b5eb083d23e2f1' 
  AND token = 'joiqH6UaS/5rddBQGdOPJeFbYITACeuwjk7/Dj7rXu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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