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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce530379eede05302f01ff6e49d9ecb5f752039afb228ae844d2b7e55800531b' 
  AND token = 'h7qh1nQoLU4pHTCzIF/6e5S5HgeZ99d1dqmaq3u5aJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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