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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ad31c3073acb36531782d99c92dc36b1e0f9c55d7587ad597ec28a793bf748' 
  AND token = 'RB/PdM8bb2ei9WGWkPyTJcOtiQlTr7EldsoOwZZR/6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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