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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f66ceb6c140116c87085b4e16b2ac004a52b0e227dea781326dca864acdfe0' 
  AND token = 'cfD4UpWI/JIw/oZV/F6PXHmxEpk0il0j/CMmHhNNg9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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