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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5455934f4a1a370bc4ad97d161d6aad9646487b22b021862ba45e6447842d29' 
  AND token = 'PrxGtz/wFPgZACzseG7pwoyS14D4C9fRwjWL7B8aUVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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