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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c13162260d564e61d7d65673d3ae6dc47e7588d74462d9362ff01ebea63924d' 
  AND token = '/ZXQqsk2ufyLuoRVFhATvj6VJZ5temEKTLtRsP/gExY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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