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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad2fc8752c2bc13b66f7ee9f7b5f91e64f39cc33b8af4a2c823b80ed7d1c2b9' 
  AND token = 'kbByrxQ2RbR5fAfTRH7eQ3INrl04ZLred/MD465Co9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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