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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05178f9cfb5de1f3f57155855ab942d09fa0db3ecccc6732d17dc7d7e2ef9352' 
  AND token = 'cMgFW8Mqd1odsKJSTmJOYexixufDZnKb7ZpAXdDurYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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