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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9ecbfda3ab344faef177e8d068f7e82fa14148d56c2d949d62edbc2ff41801' 
  AND token = 'sV8s3BsB/C9KGZMVFFoCwuM1ex/YZSTLoLg7F4kEjrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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