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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6fe6f53e563f58dd3abae15d69356b8b02b6c961ec6ea96227bb2a6c632602' 
  AND token = 'SBqFc5ePSakWEOZHMxG3q2KDn4AOi+ZtML4S7wIXWM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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