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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b137cd84a003a173f0f26061217ccfdc3dad0f580ad9c8d701ee1235ccdea6e' 
  AND token = 'cSDapTmjBqd2o4cCqpOw9AP9dfOs1rREc6BjJu7Zn04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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