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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b692e3aa00a14f85a5d84b6b18f64f66a10f5989f08e7371727720c2f36e413' 
  AND token = 'Wohoik7UCH/T8wT95ofwF5So3pCRmFUZ1dWmVng9evU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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