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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb073993b3d504c429677607e0e4704a6f129eb7a4a099ff716b8c407792d19d' 
  AND token = 'gC/iV4yqHf6gj++tjNppgcM2nLShETucG3nmVrGj6qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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