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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb9a71f8f7ec775e413d3618be85505702efbe92bae9d46481071aba53ca2f4' 
  AND token = 'ggFRYv0/FODHKInGoXAMAsSNfVYY1yoAj47wEJw2dx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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