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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25568e6e5465dda09d29e25a0dd135f7609ab1b07476c4b53cb2953e8a84ce8d' 
  AND token = 'Bo54n31UNEyDY9Qj8YndDS6//LKtmtZjgtbZgbKVrlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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