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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3870095515ee294a67f03b628cad17ed4985efc9fdf32976b2d6233d805f1868' 
  AND token = '6dE311sTTM/IDLwzgTzcW0HmGteXJ+WPjcMqwXwjz+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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