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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce6b376d748560530e861ba2aa7894b3d6208898629c42a5c9cdc0d696f97cf' 
  AND token = 'uJcuaOorDgCsSxWDqCW330Kwt6LL872RpmkNrLNKpJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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