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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282b64f3f624470a68771ba84a7822d739bea7372b4c14c76d585da39b633794' 
  AND token = '64CUklqzlyj7SIqjbPxYbbYSu10hjTiKSByruu4eG/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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