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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70097e596ecffd64845b05af6b15bf57e21c43146b3c844b072b081cac1084d3' 
  AND token = '7GwGEVlopJhKgQ739SqPaV49NbGXVnH158xJ4lYP8c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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