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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839653f029e094823f126a4c51818a9ca1c5445de47b7794c0d832a8bbd63057' 
  AND token = 'wQ7OuSxJI18LeaSbwqTQ+1A/ERcoQUT+r9x9hLpANLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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