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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c991ed85705690ad6f47debc9cc3f335ea1e73e5609a3b06f8e7b81fa1ed7e' 
  AND token = '/Wd5C/6p8mLsY5VKJ6XtifXbSsz4iSPimky+mE72wfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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