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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa964cd14afe8910d628ae82984c928cf0ae876c11007bdb7be2ba9733282f8' 
  AND token = 'MgkngMx+EjxsdFtgHW4/utuWRIQ9D/Rs3sQi1X9hRx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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