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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89127b9c8cec0e48b155c72b95ed19a989db41d9d545596c3662b49fc25476c' 
  AND token = '8zbDK8EEBuUHvX01j8ehvf9bNxSpq7xyTPLRzbsOovg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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