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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e4e798f923bc2cf637df97a87233eb10739f8c3312e8a313a6da6d1d93210d' 
  AND token = '0nsxxMkJ7LEKMiPmwefNsyz81AJFEbkRf6OqUw3WWvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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