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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3db943693e4c487eb91963c0397cbd9cdb52a3bb065a382d65c571cd07190e6' 
  AND token = 'lImMJ6VknFb6SovgoKpvEWoj3LWm5X5WC9F4aG71490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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