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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b102e9430357a7708f2870bccc7438104f0eab32a6f1ade7e76c6a5822c2c47' 
  AND token = 'B1opTzMCyH3mnNjT4xUYc9DqqKdZsGlADAMYOpGgeSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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