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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2d637d552307e7b7e43b6423e063da52ae04aa9054c8c07c83903d698d7945' 
  AND token = 'CA5E7rUhenkDYza9IVZ6wLg+Dt1kEKcT7C0GvIqtmaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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