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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9f1fdd66afcfc9a28cbf4768650dd42bda0ccffdcaf8dcb9de2b5fd2ad37de' 
  AND token = 'HOPeBacWF3G+RuG67Ns7uJe2VHZVuw8bxuGNgY9UmY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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