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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec535aad5ec07e1806b72253f18fe3e07be00141c4eb32ddb3535cb3ca8c952' 
  AND token = 'zVhxoSmcjxxm38/MGSWXku1J/6DTMLw5cwxt5Wm+WMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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