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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbff73bbebfa937164001ecafe19d603d8a64b3b45598af9b666d0cb9e5f9d6' 
  AND token = 'MCj0+wVu9tYbYNODVJ7K84BmAck6Abu+MQoKs5dt/rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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