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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695e57154fff51ef79fc366f138e37bbbec2b7e6935e97b1a7e3883bf51eba77' 
  AND token = '05m1827CoFCHe7rWAYnXfvbcFWGY030ITXwIHderGVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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