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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1c572e88adeb40d01ae306ce4670501860d45499cbdb947dd92f34f84176fe' 
  AND token = 'Y2it5P9OwPqIT17m48Zul8rdk8sDZ89uiwdfQxY/2Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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