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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d952bfa6d457d30bc44c819bffa2e5d93f3258961df212c6653f912f503aa72' 
  AND token = 'UpSd9EEsbz9qhNHZJTs1E0SFrigv9M7AfoTx/NXF8z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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