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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d40f57fbbc1ba1754822ff7ee7b74f00978355912fb9e11ab4ab28472802b1' 
  AND token = 'u1DAG+2Y3I5hG+1TqlaDWOWDI2wcx+aV04Plopqo25s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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