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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bcccb30729969ab70e0896f1d01866938b36d65b17f4156ec4912106e6929b7' 
  AND token = 'gmXSu0ZTTzeDZo7Hp84Mu4y8yEvCYHDrP8IEr0+kXnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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