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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa31f83e85e97eb2af70f436ed04bab44236867cf66a8a5417fd1b2edb621f7' 
  AND token = 'f+5KfOlRy0C2ZlJyXBdacXVehYUTcSEMYsFmLWf4tJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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