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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d581b9595c437abafb7fff5a6e1c7bfb5fa2b8f4024a0f7a5587e93764ba0a' 
  AND token = '20K23Pxaj0Z9lO6WchEGou/NFTr7ud76TZZ8ZlRQsnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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