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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7312fc9f4549ec8edcfc3b5e2cf49d462245a8f1d24d283603e840e6f2cf11' 
  AND token = '1F13r9tWJEgxKi9sLpGadhw1cwMb8ireppbaQ9FL3vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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