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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2875b0ae3caaa7021e6f7c0b1dad885cba38fb7017244525d1ff711b01715e' 
  AND token = '3qmVlHWDndNqFOe9zMAwCsGr0iW/6EurBA70DV4UXtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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