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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb652ba01260cfd9e45b86cb3d7fa4f8e7eef536782e42db5b7e369b38c2d5d' 
  AND token = 'pU+3lHc9KaP9gOXdjPHdE1BGyjWTZflOpyOCH+5+bH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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